Photosynthetica 1998, 35(4):631-635 | DOI: 10.1023/A:1006999511907

Relationships Between Nitrogen Content and Net Gas Exchange Components of a Cotton Leaf During Ontogeny

B.R. Bondada1, D.M. Oosterhuis2
1 Department of Plant & Soil Science, University of Tennessee, Knoxville, USA
2 Department of Agronomy, Altheimer Laboratory, University of Arkansas, Fayetteville, USA

Relationships between leaf nitrogen (N) content and leaf gas exchange components of a single cotton (Gossypium hirsutum L.) leaf subtending the fruit during ontogeny were investigated under field conditions. A 20-d old leaf exhibited the highest physiological activity characterized by net photosynthetic (PN) and transpiration (E) rates, stomatal conductances to CO2 exchange (gsCO2) and water vapor transfer (gsH2O), and nitrogen (N) content. With the advent of leaf senescence, the gas exchange rates declined as exhibited by the 30-, 40-, and 60-d old leaves. Regression analysis indicated close relationships between gsCO2 and PN, and gsH2O and E as the leaves advanced towards senescence. Both PN and gsCO2 were related to N as they declined with leaf age. Thus, the declines in PN were associated with stomatal closure and removal of N during leaf ontogeny.

Additional key words: Gossypium hirsutum; leaf age; photosynthesis; stomatal conductance; transpiration

Prepublished online: December 1, 1998; Published: January 1, 1998  Show citation

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Bondada, B.R., & Oosterhuis, D.M. (1998). Relationships Between Nitrogen Content and Net Gas Exchange Components of a Cotton Leaf During Ontogeny. Photosynthetica, 35(4), 631-635. doi: 10.1023/A:1006999511907
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